feat(#245): in results list, show where an image/pdf is embedded

* Add an index of embeds for reference in results

* Notes embedding images are now shown in results

* Updated dependencies

* Correctly referencing all embeds

* Updated docs

* Basic embedded feature ok

src/repositories/embeds-repository.ts

@@ -0,0 +1,77 @@
+import { getLinkpath } from 'obsidian'
+import type OmnisearchPlugin from '../main'
+import { logDebug } from '../tools/utils'
+
+export class EmbedsRepository {
+  /** Map<image or pdf, notes where embedded> */
+  private embeds: Map<string, Set<string>> = new Map()
+
+  constructor(private plugin: OmnisearchPlugin) {}
+
+  public addEmbed(embed: string, notePath: string): void {
+    if (!this.embeds.has(embed)) {
+      this.embeds.set(embed, new Set())
+    }
+    this.embeds.get(embed)!.add(notePath)
+  }
+
+  public refreshEmbeds(notePath: string): void {
+    this.embeds.forEach((value, key) => {
+      if (value.has(notePath)) {
+        value.delete(notePath)
+      }
+    })
+    this.addEmbeds(notePath)
+  }
+
+  public getEmbeds(pathEmbedded: string): string[] {
+    const embeds = this.embeds.has(pathEmbedded)
+      ? [...this.embeds.get(pathEmbedded)!]
+      : []
+    return embeds
+  }
+
+  public async writeToCache(): Promise<void> {
+    logDebug('Writing embeds to cache')
+    const database = this.plugin.database
+    const data: { embedded: string; references: string[] }[] = []
+    for (const [path, embedsList] of this.embeds) {
+      data.push({ embedded: path, references: [...embedsList] })
+    }
+    await database.embeds.clear()
+    await database.embeds.bulkAdd(data)
+  }
+
+  public async loadFromCache(): Promise<void> {
+    const database = this.plugin.database
+    if (!database.embeds) {
+      logDebug('No embeds in cache')
+      return
+    }
+    logDebug('Loading embeds from cache')
+    const embedsArr = await database.embeds.toArray()
+    for (const { embedded: path, references: embeds } of embedsArr) {
+      for (const embed of embeds) {
+        this.addEmbed(path, embed)
+      }
+    }
+  }
+
+  private addEmbeds(notePath: string): void {
+    // Get all embeds from the note
+    // and map them to TFiles to get the real path
+    const embeds = (
+      this.plugin.app.metadataCache.getCache(notePath)?.embeds ?? []
+    )
+      .map(embed =>
+        this.plugin.app.metadataCache.getFirstLinkpathDest(
+          getLinkpath(embed.link),
+          notePath
+        )
+      )
+      .filter(o => !!o)
+    for (const embed of embeds) {
+      this.addEmbed(embed.path, notePath)
+    }
+  }
+}